Progress.qml

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import QtQuick 2.0
import Qt.labs.particles 2.0

Item{
    id: container
    property variant progress: 0

    Rectangle {
        anchors.fill: parent; smooth: true
        border.color: "white"; border.width: 0; radius: height/2 - 2
        gradient: Gradient {
            GradientStop { position: 0; color: "#66343434" }
            GradientStop { position: 1.0; color: "#66000000" }
        }
    }

    ParticleSystem{
        running: container.visible
        id: barSys
    }
    ColoredParticle{
        color: "lightsteelblue"
        alpha: 0.1
        colorVariation: 0.05
        image: "images/particle.png"
        system: barSys
    }
    TrailEmitter{
        y: 2; height: parent.height-4;
        x: 2; width: Math.max(parent.width * progress - 4, 0);
        speed: AngleVector{ angleVariation: 180; magnitudeVariation: 12 }
        system: barSys
        particlesPerSecond: width;
        particleDuration: 1000
        particleSize: 20
        particleSizeVariation: 4
        particleEndSize: 12
        maxParticles: parent.width;
    }

    Text {
        text: Math.round(progress * 100) + "%"
        anchors.horizontalCenter: parent.horizontalCenter
        anchors.verticalCenter: parent.verticalCenter
        color: Qt.rgba(1.0, 1.0 - progress, 1.0 - progress,0.9); font.bold: true; font.pixelSize: 15
    }
}